Method for increasing the corrosion resistance of a chrome-plated substrate
US11268206B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 3, 2018 |
| Grant date | Mar 8, 2022 |
| Priority date | — |
| Expiry date | Oct 27, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D11/38
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The present invention relates to a method for increasing the corrosion resistance of a chrome-plated substrate wherein at least one part of a chrome-plated surface of a chrome-plated substrate is dipped into an electrolyte comprising trivalent chromium ions, at least one conducting salt and at least one reducing agent, and afterwards, a trivalent chromium oxide film is formed on the at least one part of the chrome-plated surface by applying a pulse reverse current between the chrome-plated surface and a counter electrode electrically connected with the chrome-plated surface through the electrolyte. Furthermore, the present invention relates to a chrome-plated substrate obtainable by this method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.